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r <br />TWENTYMILE COAL COMPANY <br />FOIDEL CREEK MINE <br />1983 SUBSIDENCE SURVEY REPORT <br /> I. SURVEY DATA <br /> The co-ordinates and elevation of subsidence monuments <br /> that are currently being monitored is tabulated in Appendix A. <br />' II. MAPS <br /> A. PLAN VIEW <br />' The attached map IIFC-14-8401 shows a plan view of <br /> existing underground workings, 1984 projections, surface <br /> topography and structures, and monument locations. <br /> B. CROSS SECTIONS <br /> The attached cross sectio shows the three monuments <br />' installed at Foidel Creek. No mining has taken place under <br /> these monuments in 1983. No cross sections are included for <br />' the spoils stability monuments because only one monument is <br /> installed along the slope dip at each location. <br />' III. HYDROLOGY <br /> Detailed hydrology is presented in the annual hydrologic <br />' monitoring report. <br /> IV. STRUCTURES <br />' Only development main entries were mined in 1983, hence <br /> no caving of overburden strata has taken place. Therefore, <br />' there has been no monitoring of surface structures. <br />V <br />CONCLUSIONS <br /> . <br /> Monuments have only been surveyed once for original <br />' location and mining has not advanced close enough to influence <br /> them. <br />' Mining has not advanced close enough to alluvial well and <br /> overburden aquifer monitoring locations to observe any influence <br /> No surface structures have been impacted by mining and <br /> no material damage has taken place. <br /> <br />^ <br /> <br />